The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is____________________?
A. 2
B. 0.5
C. 50
D. 150
Month: February 2019
Bound moisture is that liquid which exerts an equilibrium vapor pressure ________________ that of the pure liquid at the given temperature ?
Bound moisture is that liquid which exerts an equilibrium vapor pressure ________________ that of the pure liquid at the given temperature ?
A. Less than
B. More than
C. Equal to
D. Either A. or B.; depends on the solid
With increase in temperature, the rate of leaching increases, because the___________________?
With increase in temperature, the rate of leaching increases, because the___________________?
A. Diffusivity of solute increases
B. Viscosity of solvent decreases
C. Thermal conductivity of solute increases
D. None of these
Leaching rate is independent of the________________?
Leaching rate is independent of the________________?
A. Agitation
B. Temperature
C. Particle size
D. None of these
Sodium bicarbonate is produced during soda ash manufacture using a _______________ tower?
Sodium bicarbonate is produced during soda ash manufacture using a _______________ tower?
A. Plate
B. Baffle
C. Packed
D. None of these
The cooling effect in a cooling tower cannot be increased by_____________________?
The cooling effect in a cooling tower cannot be increased by_____________________?
A. Increasing the air velocity over the wet surfaces
B. Reducing the humidity of entering air
C. Lowering the barometric pressure
D. None of these
For a single component absorber, the operating line is straight only when plotted in term of ______________ units?
For a single component absorber, the operating line is straight only when plotted in term of ______________ units?
A. Partial pressure
B. Mole ratio
C. Mole fraction
D. None of these
Dimension of mass diffusivity is the same as that of_____________________?
Dimension of mass diffusivity is the same as that of_____________________?
A. Kinematic viscosity
B. Dynamic viscosity
C. Surface tension
D. Pressure
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?
A. Kc = Kp = Km
B. Kc = Kp/RT = Km . RT/P
C. Kc = Kp . RT = Km . RT/p
D. None of these
The temperature of water cooled in cooling tower is always _________________ temperature of entering air?
The temperature of water cooled in cooling tower is always _________________ temperature of entering air?
A. More than the wet bulb
B. Less than the wet bulb
C. Equal to the wet bulb
D. Equal to the dry bulb